Thanks, I took a look. It is not the most coherent presentation but I can see there were examples of crappy posts in there, but so there are everywhere else. The AWS letter made the most reasonable argument and it amounted to an indictment of Parler's technical ability to keep manual moderation working in the face of increasing traffic. Whether that really was the problem or just a virtue display from Amazon is unclear to me.
Vice also published a good summary of the stuff that was scraped from Parler when their SaaS providers went down, but most of it is based on interview with the Twitter user above.
https://twitter.com/donk_enby/
She links to a bunch of other articles and sources as well, including lists of moderators etc...